Massimiliano Melchiorre (a), Dario Di Giuseppe (b), Umberto Tessari (b) & Barbara Faccini (b)
(a) Group of Dynamics of the Lithosphere, Institute of Earth Sciences Jaume Almera ICTJA – CSIC, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain. E-mail: mmelchiorre@ictja.csic.es
(b) Department of Physics and Earth Sciences, University of Ferrara, Via Saragat 1, 44122 Ferrara, Italy